New alloying systems for PM-steels: opportunities for the Mn-Si master alloys
Paper in proceedings, 2013

Low alloyed steels containing innovative combinations of alloying elements have been produced though the master alloy route. Fe-Mn-Si master alloy systems were designed to enhance sintering by creating a liquid phase, and were manufactured by gas atomizing in N2. This paper presents an overview of the characteristics of steels modified with Fe-Mn-Si master alloys. Special focus is given to defining the proper conditions for sintering, and to analyzing the level of mechanical properties achievable with standard processing conditions. Although high temperatures (>1300 ºC) are required for reducing highly stable Mn-Si oxides, standard sintering cycles at 1120 and 1250 ºC yielded oxygen contents below 0.1 wt.% and 0.02 wt.% respectively, combined with competitive mechanical properties in the as sintered condition. UTS values around 600 MPa, elongations between 1-3%, hardness values of 200-350 HV10 and impact energies around 10-30 J can be obtain with less than 3 wt.% of alloying elements. Besides, a proper balance of swelling upon liquid phase formation and isothermal shrinkage provides dimensional changes below 0.1 %

mechanical properties

oxidation-sensitive elements

sintering conditions

Mn-Si master alloys


Raquel De Oro Calderón

Chalmers, Materials and Manufacturing Technology, Surface and Microstructure Engineering

Monica Campos

Universidad Carlos III de Madrid

Jose Manuel Torralba Castello

Universidad Carlos III de Madrid

IMDEA Institute

International Powder Metallurgy Congress and Exhibition, Euro PM 2013; Gothenburg; Sweden; 15 September 2013 through 18 September 2013

Subject Categories

Materials Engineering

Areas of Advance




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